P1117 Engine Coolant Temperature Sensor Intermittent
What does P1117 mean on a Ford?
P1117 — Engine Coolant Temperature Sensor Intermittent. This Ford-enhanced code applies to F-150, Explorer, Ranger, Mustang, Taurus.
Common causes of P1117
- Loose ECT connector
- Chafed ECT wiring opening with vibration
- Failing sensor with temperature-dependent dropout
- Corroded terminals
- Air pocket around the sensor from low coolant
How to fix P1117
- Top off coolant and bleed air pockets
- Wiggle-test the ECT harness while graphing temperature
- Inspect terminals for corrosion
- Compare the signal to a thermometer at the housing
- Replace the sensor if dropouts continue